JP2007271025A - Release valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a release valve having a sealing property, capable of tightly contacting a valve part to a valve seat when closing a valve, preventing leakage of a coolant. <P>SOLUTION: A release valve 8 comprises a valve body 11 equipped with a valve body storing part 11a, a flow-in pipe 13 and flow-out pipe 14 connected to the valve body 11, and a cylindrical hooking rod storing part 12 with a lid which protrudes sideways from the valve body 11. An oblong hooking rod 18, a coil spring 20 arranged between the hooking rod 18 and the inner wall of the hooking rod storing part 12, and a shrinkable hooking rod bellows 19 which connects a specified position of the hooking rod 18 with the inner wall of the hooking rod storing part 12, stored in the hooking rod storing part 12. A hooking rod storing part 12 and the flow-in pipe 13 are connected with each other by a communication path 20 of small aperture. If the coolant pressure on the side of the flow-in pipe 13 is a specified value or less, the hooking rod 18 energized to the coil spring 20 is made to engage with the upper end edge of a valve part 15a of the valve 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a release valve used in a refrigerant circuit such as an air conditioner, and more particularly to a configuration with improved sealing performance that prevents refrigerant leakage when the valve is closed.

  A conventional release valve 50 used in a refrigerant circuit or the like of an air conditioner is formed as a covered cylinder as shown in FIG. 6, for example, and a valve main body provided with a valve seat 56 with a valve hole 56 a formed in the lower part. 51, an inflow pipe 52 connected to the lower end of the valve body 51 facing the valve seat 56 and into which refrigerant flows, an outflow pipe 53 connected to the side surface of the valve body 51 and through which refrigerant flows, In the valve body 51, a spherical valve portion 55 that contacts or leaves the valve seat 56 and opens and closes the valve hole 56a, and a slide shaft that presses the valve portion 55 against the valve seat 56. 54, a coil spring 58 that urges the slide shaft 54, and a telescopic bellows 57 that insulates the slide shaft 54 and the coil spring 58 from the refrigerant.

  When a fluid pressure higher than a predetermined pressure is applied to the valve portion 55 from the inflow pipe 52 side, the valve portion 55 separates from the valve seat 56 against the pressing force of the coil spring 58, thereby the outflow. A refrigerant flows out from the pipe 53 to the outflow pipe 53 side through the valve body 51.

  However, when the valve portion 55 is pressed only by the pressing force of the coil spring 58, the valve portion 55 slightly changes even if the fluid pressure from the inflow pipe 52 is equal to or lower than a predetermined pressure. Since the phenomenon of separation from 56 occurs, there may be a problem that the refrigerant leaks from the outflow pipe 53 to the outflow pipe 53 side.

  As another conventional example, for example, as shown in Patent Document 1, a valve body and a valve portion are integrally formed of an elastic material so that a reinforcing member is embedded in the valve portion, thereby improving the sealing performance of the valve portion. Although improved techniques have been presented, the structure was somewhat complicated.

JP-A-6-109152 (page 3, FIG. 1)

  In view of the above problems, an object of the present invention is to provide a release valve that improves the sealing performance to ensure close contact between a valve portion and a valve seat when the valve is closed and to prevent refrigerant leakage.

  In order to solve the above-described problems, the present invention provides a valve body in which an inflow pipe and an outflow pipe are connected, a valve seat formed in the valve body facing the inflow pipe and having a valve hole, The valve body is provided movably on the same axis as the inflow pipe, has a valve portion that comes into contact with the valve seat, and is biased by the valve seat, on the side of the valve body, on the valve seat Corresponding locking rod storage portions provided in the locking rod storage portion are supported so as to be movable in different directions from the valve body and hold the valve portion of the valve body in the valve seat. It has a configuration comprising a stopper, an urging means for urging the locking rod toward the valve body side, and a communication path for communicating the locking rod storage portion and the inflow pipe.

  Further, when the fluid pressure in the inflow pipe is equal to or less than a predetermined value, the fluid pressure in the inflow pipe becomes equal to or higher than the predetermined value while being biased by the biasing means and the locking rod locks the valve body. In this case, the locking rod is moved by the fluid pressure propagated through the communication passage and is detached from the valve body.

  Further, the upper surface of the valve seat is formed in a flat surface, and the lower surface of the valve portion provided in the valve body is formed in a flat surface corresponding to the valve seat, while the upper surface of the valve portion has the locking rod It is the structure which formed the inclined surface which the front-end | tip part latches.

  Moreover, the said latching hook storage part becomes a structure provided in a pair corresponding to the said valve main body.

  In addition, the communication passage is formed with a diameter smaller than that of the valve hole, and the retreat time of the refrigerant retreating from the locking rod storage portion to the inflow pipe requires a predetermined time, so that the fluid pressure in the inflow pipe has a predetermined value. When the following occurs, the valve body is configured to return to the valve seat earlier than the locking rod.

  According to the present invention, the invention according to claim 1 includes a valve body in which an inflow pipe and an outflow pipe are connected, a valve seat formed in the valve body facing the inflow pipe and having a valve hole, and the valve A valve body provided in the main body so as to be movable on the same axis as the inflow pipe and having a valve portion that comes into contact with the valve seat and urged by the valve seat, and on the side of the valve body, the valve A locking rod storage portion provided corresponding to the seat, and a locking rod storage portion provided in the locking rod storage portion, supported so as to be movable in a different direction from the valve body, and holding the valve portion of the valve body in the valve seat And a urging means that urges the locking rod toward the valve body, and a communication passage that communicates the locking rod storage portion with the inflow pipe. In order to prevent the phenomenon that the refrigerant leaks from the inflow pipe to the outflow pipe through the valve body, the valve body is brought into close contact with the valve seat. You have me.

  In the invention according to claim 2, when the fluid pressure in the inflow pipe is equal to or lower than a predetermined value, the urging means urges the valve body to lock the valve body. When the fluid pressure exceeds a predetermined value, the locking rod moves due to the fluid pressure propagated through the communication path and is separated from the valve body. In this case, the locking rod locks the valve body and holds the valve portion so as to be in close contact with the valve seat. On the other hand, when the fluid pressure exceeds a predetermined value, the fluid propagated through the communication path The locking rod is moved smoothly by the pressure, and the valve portion is also moved to sufficiently open the valve hole.

  In the invention according to claim 3, the upper surface of the valve seat is formed in a flat surface, and the lower surface of the valve portion provided in the valve body is formed in a flat surface corresponding to the valve seat. Due to the configuration in which the inclined surface on which the front end portion of the locking rod is locked is formed on the top surface of the portion, the front end portion of the locking rod is more reliably locked to the valve body.

  According to a fourth aspect of the present invention, there is provided a structure in which the locking rod storage portion is provided in the valve body as a corresponding pair, and the valve portion of the valve body is further in close contact with the valve seat so that the refrigerant is The phenomenon of leakage can be prevented.

  According to a fifth aspect of the present invention, there is provided a configuration in which the communication passage is formed with a diameter smaller than the valve hole of the valve seat, and the retreat time of the refrigerant retreating from the locking rod storage portion to the inflow pipe requires a predetermined time. When the fluid pressure in the inflow pipe becomes a predetermined value or less, the valve body surely returns to the valve seat earlier than the locking rod.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

  FIG. 1 is a refrigerant circuit using a release valve according to the present invention, and FIG. 2 is a sectional view of the release valve according to the first embodiment. 3 to 5 are sectional views of the release valve showing the second embodiment to the fourth embodiment.

  An air conditioner using a release valve according to the present invention is, for example, as shown in FIG. 1 (A), a decompression means comprising a compressor 3, an outdoor heat exchanger 4 serving as a condenser, and an expansion valve or a capillary tube. 5 and an indoor heat exchanger 6 serving as an evaporator are sequentially connected, and an outflow side of the outdoor heat exchanger 4 and an inflow side of the indoor heat exchanger are connected to a bypass path 7 having a release valve 8. And the refrigerant circuit 1 is configured. The release valve 8 opens the valve when the refrigerant pressure from the inflow side exceeds a predetermined value, and causes the refrigerant to flow out to the outflow side.

  In the refrigerant circuit 1, high-temperature and high-pressure refrigerant is discharged from the compressor 3 in the direction indicated by the arrow and flows into the outdoor heat exchanger 4. The refrigerant that has flowed in is condensed by releasing heat to the surroundings, and the condensed refrigerant is then adiabatically expanded by the decompression means 5 to become a low temperature and a low pressure and flows into the indoor heat exchanger 6. The refrigerant that has flowed into the indoor heat exchanger 6 absorbs ambient heat and evaporates, and the evaporated refrigerant flows back to the compressor 3.

  However, since the ambient temperature of the outdoor heat exchanger 4 is high and the amount of refrigerant condensed is low, the outflow side refrigerant pressure of the outdoor heat exchanger 4 becomes higher than that, and the heat insulation in the decompression means 5 is performed. The expansion and the refrigerant evaporation in the indoor heat exchanger 6 are hindered. In such a case, in order to prevent an abnormal rise in the refrigerant pressure, when the inflow-side refrigerant pressure of the release valve 8 in the bypass passage 7 is equal to or higher than a predetermined value, the release valve 8 is opened and the refrigerant is The heat is discharged from the outflow side of the heat exchanger 4 to the inflow side of the indoor heat exchanger 6 through the bypass passage 7.

  As another refrigerant circuit, as shown in FIG. 1 (B), a compressor 3, an outdoor heat exchanger 4, a decompression means 5, and an indoor heat exchanger 6 are sequentially connected, and the outdoor heat exchanger 4 is also connected. The refrigerant circuit is also constructed by connecting the outflow side of the compressor and the inflow side of the compressor 3 by a bypass passage 9 provided with a release valve 10. The refrigerant circuit opens the release valve 10 when the inflow side refrigerant pressure of the release valve 10 in the bypass passage 9 is equal to or higher than a predetermined value, and opens the compressor 3 from the outflow side of the outdoor heat exchanger 4. The refrigerant is discharged to the inflow side.

  As shown in the cross-sectional view of FIG. 2 (A), the release valve 8 is formed in a covered cylindrical shape, includes a valve body storage portion 11a inside, and a valve body 11 in which a valve seat 17 is formed in the lower portion, An inflow pipe 13 connected to the lower end of the valve main body 11 facing the valve seat 17, an outflow pipe 14 connected to an opening opened in a side surface of the valve main body 11, and a lateral side from the valve main body 11. And a lid-like cylindrical locking rod storage portion 12 projecting from the top.

  The valve seat 17 is formed with a valve hole 17a penetrating vertically, and has a circular arc section and a conical receiving portion formed on the upper surface. The valve body storage portion 11a in the valve body 11 includes a hemispherical valve portion 15a that contacts the receiving portion of the valve seat 17 and a rod-like connecting shaft 15b that is formed integrally with the valve portion 15a. The valve body 15 is accommodated, and the predetermined position of the connecting shaft 15b and the upper wall of the valve body accommodation portion 11a are connected by a retractable valve body bellows 16 having a spring property, so that the valve body 15 is connected. Is supported so as to be movable up and down, and is urged toward the valve seat 17 by the valve body bellows 16.

  When the valve body 15 moves downward, the valve portion 15a comes into close contact with the valve seat 17 and closes the valve hole 17a, while when the valve body 15 moves upward, the valve portion 15a moves to the valve seat 17. And the valve hole 17a is opened, and by opening the valve hole 17a, the refrigerant from the inflow pipe 13 flows out to the outflow pipe 14 through the valve body 11. It is like that.

  In the inside of the lid-shaped locking rod storage portion 12 with one end closed, a horizontally long locking rod 18 having a claw portion at one end on the valve body 15 side and a disk-shaped receiving plate formed at the other end. A coil spring 20 disposed between the receiving plate of the locking rod 18 and the inner wall of the locking rod storage portion 12, and urging the locking rod 18 toward the valve body 15; A telescopic locking rod bellows 19 that connects a predetermined position of the rod 18 and the inner wall of the locking rod storage portion 12 is stored. Further, the locking rod storage portion 12 and the inflow pipe 13 are communicated with each other by a thin communication path 20a, and the refrigerant pressure of the inflow pipe 13 is applied to the locking rod bellows 19 through the communication path 20a. It is like that.

  One side of the locking rod 18 is formed in the side wall of the valve body storage portion 11a, and is supported in a support hole provided with a sealing material 11b so as to be slidable back and forth. By being supported by the inner wall of the storage portion 12, it is stored in the locking rod storage portion 12 so as to be slidable back and forth, and when urged by the coil spring 20, the claw portion is a valve of the valve body 15. The upper end edge of the portion 15a is locked.

  When the valve portion 15a of the valve body 15 closes the valve hole 17a of the valve seat 17, the claw portion of the locking rod 18 is locked to the upper edge of the valve portion 15a, so that the hemisphere When the refrigerant pressure on the inlet pipe 13 side is equal to or lower than a predetermined value, the close contact state is maintained when the valve portion 15a formed in the shape is in close contact with the conical receiving portion of the valve seat 17. Thus, leakage of the refrigerant from the inflow pipe 13 to the outflow pipe 14 can be prevented.

  When the refrigerant pressure on the inflow pipe 13 side reaches a predetermined value or more, as shown in FIG. 2 (B), the refrigerant pressure is applied to the locking rod bellows 19 of the locking rod storage portion 12 through the communication passage 20a. The locking rod bellows 19 is compressed. As a result, the locking rod 18 connected to the locking rod storage portion locking rod bellows 19 retreats toward the locking rod storage portion 12 against the biasing force of the coil spring 20. ing. When the locking rod 18 is retracted, the claw portion is detached from the upper end edge of the valve portion 15a.

  When the locking rod 18 is disengaged, the valve body 15 is disengaged from the valve seat 17 and moved upward by the refrigerant pressure applied to the valve portion 15a through the valve hole 17a. As a result, the valve hole 17a is opened, and the refrigerant from the inflow pipe 13 flows out to the outflow pipe 14 through the valve hole 17a and the valve body storage portion 11a. At this time, the valve hole 17a is completely opened, so that the refrigerant whose pressure has abnormally increased is sufficiently discharged to the outflow pipe 14 side. Further, when the refrigerant pressure on the inflow pipe 13 side becomes a predetermined value or less, the valve body 15 is lowered, the valve portion 15a closes the valve hole 17a of the valve seat 17 again, and the engagement is stopped. The hook 18 is urged by the coil spring 20 to move forward, and the claw portion of the locking hook 18 is locked to the upper edge of the valve portion 15a.

  When the refrigerant pressure on the inflow pipe 13 side becomes a predetermined value or less and the valve body 15 and the locking rod 18 return, the locking rod bellows 19 is formed by a member having higher rigidity than the valve body bellows 16. The speed of expansion and contraction is slower than that of the valve body bellows 16, so that the valve body 15 returns faster than the locking rod 18. In addition, the retaining rod storage portion 12 and the inflow pipe 13 communicate with each other through the communication hole 20a which is narrower than the valve hole 17a, so that the refrigerant retreats from the locking rod storage portion 12 to the inflow tube 13. The retraction time is required to be a predetermined time, thereby preventing the locking rod 18 from returning earlier than the valve body 15. Further, the end surface of the locking rod 18 on the valve body 15 side is inclined, and even if the locking rod 18 tries to return earlier than the valve portion 15a, the valve portion 15a contacts the inclined surface. The valve body 15 is returned earlier than the locking rod 18 by being pressed.

  As shown in FIG. 3, the release valve 21 in the second embodiment includes a valve main body 22 that connects the inflow pipe 13 and the outflow pipe 14, and a locking rod storage portion that protrudes laterally from the valve main body 22. 12 and the configuration of the locking rod storage portion 12 is the same as that of the first embodiment. The valve main body 22 accommodates a valve body 15 composed of a hemispherical valve portion that contacts the valve seat 17 and a rod-shaped connecting shaft, and a predetermined position of the connecting shaft and an inner wall of the valve main body 22 are accommodated. And a coil spring 23 that urges the valve body 22 downward between the upper part of the valve body 15 and the upper wall of the valve body 22. Is arranged. The coil spring 23 is formed of a spring material having a higher spring property than the coil spring 20 disposed in the locking rod storage portion 12 and biasing the locking rod 18, thereby reducing the refrigerant pressure in the inflow pipe 13. When the valve body 15 and the locking rod 17 return toward the valve seat 17, the valve body 15 quickly returns from the locking rod 18, and then the locking rod 18 returns. Thus, the valve portion of the valve body 15 is locked.

  In the third embodiment, as shown in FIG. 4, the upper surface of the valve seat 25 in which the valve hole is formed is a flat surface, and the lower surface of the valve portion 24 a of the valve body 24 is a flat surface so as to correspond to the valve seat 25. On the other hand, a gentle inclined surface is formed on the upper surface of the valve portion 24a, and the claw portion of the locking rod 18 is locked to the inclined surface. As a result, the valve portion 24a comes into close contact with the valve seat 25, and the leakage of the refrigerant can be prevented as much as possible.

  As shown in FIG. 5, the fourth embodiment includes a valve body 22, a right-side locking rod storage portion 32 a and a left-side locking rod storage portion 32 b that protrude from the valve body 22 toward both sides. Each accommodates a right locking rod 33a, a left locking rod 33b, a right coil spring 35a, a left coil spring 35b, a right bellows 34a, and a left bellows 34b. An inflow pipe 36 is connected to the lower part of the valve body 22, and an outflow pipe 37 is connected to the side surface in a direction orthogonal to the right side locking rod storage portion 32 a and the left side locking rod storage portion 32 b. ing. In the valve body 22, a valve body 15 including a valve portion that contacts the valve seat 31 and a connecting shaft, a valve body bellows 16 that connects the connecting shaft and the inner wall of the valve body 15, and the valve body 15. And a coil spring 23 for biasing the valve seat 31 to the valve seat 31 are housed.

  A pair of the locking rod right locking rod 33a and the left locking rod 33b accommodated in the right locking rod storage portion 32a and the left locking rod storage portion 32b is engaged with the upper edge of the valve portion of the valve body 15. By doing so, the valve portion can be more closely attached to the valve seat 31, thereby preventing the refrigerant from leaking.

Both (A) and (B) are refrigerant circuits using the release valve according to the present invention. (A) is sectional drawing of the release valve by a 1st Example. (B) is sectional drawing which shows the state by which the release valve was open | released. It is sectional drawing of the release valve by a 2nd Example. It is principal part sectional drawing of the release valve by a 3rd Example. It is sectional drawing of the release valve by 4th Example. It is sectional drawing of the release valve by a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerant circuit 2 Refrigerant circuit 3 Compressor 4 Outdoor heat exchanger 5 Depressurization means 6 Indoor heat exchanger 7 Bypass path 8 Release valve 9 Bypass path 10 Release valve 11 Valve body 11a Valve body storage part 11b Sealing material 12 Locking rod storage Part 13 Inflow pipe 14 Outlet pipe 15 Valve body 15a Valve part 15b Connection shaft 16 Valve body bellows 17 Valve seat 17a Valve hole 18 Locking rod 19 Locking rod bellows 20 Coil spring 20a Communication path 21 Release valve 22 Valve body 23 Coil spring 24 Valve body 24a Valve portion 25 Valve seat 27 Valve body 28 Coil spring 29 Valve body 30 Bellows 31 Valve seat 32a Right side lock rod storage portion 32b Left side lock rod storage portion 33a Right side lock rod 33b Left side lock rod 34a Right side bellows 34b Left bellows 35a Right coil spring 35b Left coil spring 36 Inflow pipe 37 Outflow pipe

Claims (5)

  A valve body connecting the inflow pipe and the outflow pipe, a valve seat formed in the valve body facing the inflow pipe and having a valve hole, and moving in the valve body on the same axis as the inflow pipe A valve body that can be provided and has a valve portion that contacts the valve seat, and is biased by the valve seat, and a locking rod storage portion that is provided on the side of the valve body corresponding to the valve seat A locking rod that is provided in the locking rod storage portion and is supported so as to be movable in a different direction from the valve body, and holds the valve portion of the valve body on the valve seat; A release valve comprising: an urging means for urging the body side; and a communication passage for communicating the locking rod storage portion and the inflow pipe.   When the fluid pressure in the inflow pipe is less than or equal to a predetermined value, when the fluid pressure in the inflow pipe becomes greater than or equal to a predetermined value while being biased by the biasing means and the locking rod locks the valve element 2. The release valve according to claim 1, wherein the locking rod is moved by the fluid pressure propagated through the communication path and is detached from the valve body.   The upper surface of the valve seat is formed in a flat surface, and the lower surface of the valve portion provided in the valve body is formed in a flat surface corresponding to the valve seat, while the tip of the locking rod is formed on the upper surface of the valve portion. The release valve according to claim 1, wherein an inclined surface to which the portion is locked is formed.   The release valve according to claim 1, wherein the locking rod storage portion is provided in a pair corresponding to the valve main body. The communication passage is formed with a diameter smaller than that of the valve hole, and the retreat time of the refrigerant retreating from the locking rod storage portion to the inflow pipe requires a predetermined time, so that the fluid pressure in the inflow pipe is less than a predetermined value. 2. The release valve according to claim 1, wherein the valve body returns to the valve seat earlier than the locking rod.

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